写一个深度拷贝

类别：js / 日期：2022-11-08 / 浏览：269 / 评论：0

function clone( obj ) {
    var copy;
    switch( typeof obj ) {
        case "undefined": break;
        case "number": copy = obj - 0;
            break;
        case "string": copy = obj + "";
            break;
        case "boolean": copy = obj;
            break;
        case "object": //object 分为两种情况 对象（Object）和数组（Array）
            if(obj === null) {
                copy = null;
            } else {
                if( Object.prototype.toString.call(obj).slice(8, -1) === "Array") {
                    copy = [];
                    for( var i = 0 ; i < obj.length ; i++ ) {
                        copy.push(clone(obj[i]));
                    }
                } else {
                    copy = {};
                    for( var j in obj) {
                        copy[j] = clone(obj[j]);
                    }
                }
            }
            break;
        default: copy = obj;
            break;
    }
    return copy;
}